To advance the technology of polymer electrolyte membrane fuel cells, material development is at ... more To advance the technology of polymer electrolyte membrane fuel cells, material development is at the forefront of research. This is especially true for membrane electrode assembly, where the structuring of its various layers has proven to be directly linked to performance increase. In this study, we investigate the influence of the various ingredients in the cathode catalyst layer, such as ionomer content, catalyst loading and catalyst type, on the oxygen and ion transport using a full parametric analysis. Using two types of catalysts, 40 wt.% Pt/C and 60 wt.% Pt/C with high surface area carbon, the ionomer/carbon content was varied between 0.29–1.67, while varying the Pt loading in the range of 0.05–0.8 mg cm−2. The optimum ionomer content was found to be dependent on the operating point and condition, as well as catalyst loading and type. The data set provided in this work gives a starting point to further understanding of structured catalyst layers.
Broiler litter (BL) has the potential to be used as an alternative multi-nutrient source for soyb... more Broiler litter (BL) has the potential to be used as an alternative multi-nutrient source for soybean (Glycine max L.) production. While previous research on soybean yield response to BL has reported inconsistent results, the effects of BL application on soybean seed nutrient concentrations are largely unknown or less studied. The objective of this two-year field study was to investigate the effect of BL application on soybean yield and seed nutrient content in three different soil types and production environments. To pursue the objective, a field experiment was established in 2018 in a Compass loamy sand with four BL rates (0, 2.2, 5.6, and 11.2 Mg BL ha−1). In 2019, the study was expanded to include two additional soil types (Decatur silty clay loam and Dothan fine sandy loam) totaling four site years. The experimental design at each site was a randomized complete block with four replications. Application of BL had no impact on soybean yield in the first year, regardless of applic...
Journal of Biomolecular Structure and Dynamics, 2021
Glycogen synthase kinase-3 (GSK-3), a constitutively active serine/threonine kinase, primary regu... more Glycogen synthase kinase-3 (GSK-3), a constitutively active serine/threonine kinase, primary regulator of various cellular activities varying from glycogen metabolism to cell proliferation and regulation. GSK-3β is associated with the pathogenesis of numerous human diseases, including cancer, metabolic disorder, and Alzheimer's disease. In this study, Azadirachta indica compounds were selected and further screened on the BOILED-Egg model. The compounds showing good GIT absorption were docked with the crystal structure of GSK-3β. The compounds with high docking score were submitted for the molecular dynamic simulation (MDS) and Molecular Mechanics Poisson-Boltzmann Surface Area (MM-PBSA). Based upon the MDS and MM-PBSA study, gedunin showed the highest binding energy throughout the MDS process. Gedunin was isolated from the Azadirachta indica, and its efficacy on GSK-3β inhibition was studied in the human neuroblastoma (SH-SY5Y) cells. Gedunin induced apoptosis and anti-proliferative activity by arresting G2/M phase, as evident by cell-cycle analysis. From immunoblot study, gedunin significantly enhanced the expression of an inhibitory form of GSK-3β (p-GSK-3β Ser9) in concentration-dependent manner. Our findings demonstrate that gedunin may act as an effective GSK-3β inhibitor suggesting that this compound may be used for the management of neuroblastoma. Further preclinical and clinical investigation is desirable.Communicated by Ramaswamy H. Sarma.
ABSTRACT Extraction of electrical power from solar photovoltaic (PV) systems under nonuniform irr... more ABSTRACT Extraction of electrical power from solar photovoltaic (PV) systems under nonuniform irradiance such as partial shading (PSC) or fast transient conditions (FTC) is the most challenging task for the solar PV researchers. Inaccurate detection of PSC or FTC affects the efficiency of maximum power point tracking (MPPT) algorithms. As multiple peaks are found in the P–V curve, searching of the global peak among local peaks and stabilizing the output voltage is a typical task for an MPPT algorithm during PSC or FTC. Particularly for small isolated PV systems, the output system voltage stability is of more concern than power efficiency during PSC. Here, a Modified Perturb and Observation (P&O) (MP&O) MPPT algorithm is proposed for accurate detection of PSC, which stabilizes the system output voltage without compromising with power efficiency. For accurate detection of PSC, the MP&O MPPT algorithm uses irradiance (Ir(k)) and generated PV power (P(k)) as an input parameter and regulates the step size (dD) of the boost converter duty cycle (D). A PV system is simulated in MATLAB/Simulink and the performance of the proposed algorithm is also investigated using dSPACE controller, solar PV emulator and a SiC Mosfet switch under PSC. The accuracy to detect PSC or FTC of this algorithm is found satisfactory with fast tracking speed.
Journal of Evolution of Medical and Dental Sciences, 2017
BACKGROUND Gastroesophageal reflux disease, alkali or acid ingestion, achalasia due to unknown ae... more BACKGROUND Gastroesophageal reflux disease, alkali or acid ingestion, achalasia due to unknown aetiology are considered as main causative factors in the genesis of benign oesophageal strictures. The two types of treatment modalities are used including conservative dilatation and surgical approach according to aetiology and site of involvement. Our study attempts to understand the various aetiopathogenesis and epidemiological features of this problem and their clinical presentation; so that early detection maybe planned and various treatment modalities for achalasia cardia, peptic stricture, corrosive stricture and their results are evaluated. The aim of the study is to study various-1. Aetiological factors of stricture oesophagus (benign). 2. Features and clinical presentation of stricture oesophagus, so that early detection maybe planned. 3. Treatment methods of management of benign oesophageal strictures. MATERIALS AND METHODS This is a descriptive study of dysphagia due to benign oesophageal strictures. Cases presenting in the surgical outdoor with symptoms suggestive of oesophageal stricture and admitted in different surgical and gastroenterology units were included in the study. A detailed history and examination was done in these patients. Management was done by endoscopic or manual dilatation with bougies and/or surgical operation. Surgical management consisted of Heller's cardiomyotomy or oesophagoplasty. RESULTS Total number of 40 patients of dysphagia due to benign oesophageal strictures were studied out of which 16 (40%) patients were of corrosive strictures, 14 (35%) having achalasia cardia and 10 (25%) of peptic strictures. The male-to-female ratio was 1.35:1. The mean age was 42.62 years. Strictures due to corrosive were more common in younger age groups while 20170912mthe peptic stricture occurred later in life. The incidence of various symptoms were dysphagia 100%, regurgitation 45%, epigastric or substernal pain 35%, weight loss 25% and cough in 12% cases. Patients with GERD or achalasia cardia had more dysphagia to liquid/semi-solids, while patients with corrosive ingestion (alkali/acid) had more dysphagia to solids. The most common site affected was lower third of oesophagus in 55% of cases, followed by middle third (40%) and upper third (5%). In present study, out of 40 patients, 25 patients were treated conservatively in form of dilatation and operative intervention was done in 15 patients. All of the patients of stricture due to GERD were treated by conservative management. Most of the patients with corrosive ingestion/unknown aetiology were treated by conservative management. All of the patients with achalasia cardia were treated by operative management. One patient out of 25 managed with conservative treatment developed complication in the form of oesophageal perforation. Out of 15 patients that were managed by operative treatment, 5 developed pulmonary complications and 5 developed wound infections. Out of 4 patients who had undergone oesophagoplasty, 2 suffered with minor anastomotic leaks. In our study, after treatment (surgery/dilatation), 85% of patients were able to swallow most of solids and liquids, 10% of patients could swallow only solids and 5% of patients could swallow only liquids or semisolids. CONCLUSION It can be concluded that dysphagia due to benign oesophageal stricture maybe because of post-corrosive stricture, peptic stricture, achalasia cardia, etc. Conservative treatment in the form of dilatation gives excellent results in management of dysphagia. The surgery should be offered to the patients who are otherwise fit and dilatation cannot be done due to very narrow stricture. In operative patients, results of Heller's cardiomyotomy and esophagoplasties are excellent.
Lesions of the central nucleus of the third cranial nerve in midbrain leads to bilateral ptosis. ... more Lesions of the central nucleus of the third cranial nerve in midbrain leads to bilateral ptosis. We present a case of a 14 year old boy, who was found to have B/L non-correctable ptosis and medial rectus palsy. There was a ring enhancing lesion in the midbrain in contrast MRI which resolved with treatment. The case exemplifies that bilateral ptosis results from the central nucleus involvement of third nerve which has bilateral innervation.
International Journal of Renewable Energy Development, 2018
Small solar PV systems mostly residential PV systems are bounded to be low cost. So these systems... more Small solar PV systems mostly residential PV systems are bounded to be low cost. So these systems are required low-cost processors, and these low-cost processors can only process simple algorithm efficiently. The conventional P&O MPPT algorithm is widely employed algorithm to control solar PV systems because of its simplicity, low cost, and ease of implementation. During rapid radiation change condition (RRC) the output voltage of conventional P&O MPPT algorithm is found unstable and suffers oscillations around MPP at transient and steady state conditions. This paper proposes a simple MPPT algorithm for small or residential solar PV systems to eliminate such above said drawbacks. The proposed MPPT controls the step size (dD) of the boost converter duty cycle (D) according to the system input conditions and have the ability to compensate the transient as well as steady-state oscillations around MPP and stabilize the output voltage under RRC and variable load conditions. To validate t...
Microwave-assisted cyclocondensation of title compounds afforded unreported imidazo[1,2-a] quinox... more Microwave-assisted cyclocondensation of title compounds afforded unreported imidazo[1,2-a] quinoxaline and benzo[f]imidazo[1,5-a][1,3,5]triazepines in high yields.
Physical, chemical, and biological interactions between groundwater and sedimentary rock directly... more Physical, chemical, and biological interactions between groundwater and sedimentary rock directly control the fundamental subsurface properties such as porosity, permeability, and flow. This is true for a variety of subsurface scenarios, ranging from shallow groundwater aquifers to deeply buried hydrocarbon reservoirs. Microfluidic flow cells are now commonly being used to study these processes at the pore scale in simplified pore structures meant to mimic subsurface reservoirs. However, these micromodels are typically fabricated from glass, silicon, or polydimethylsiloxane (PDMS), and are therefore incapable of replicating the geochemical reactivity and complex three-dimensional pore networks present in subsurface lithologies. To address these limitations, we developed a new microfluidic experimental test bed, herein called the Real Rock-Microfluidic Flow Cell (RR-MFC). A porous 500μm-thick real rock sample of the Clair Group sandstone from a subsurface hydrocarbon reservoir of the...
Journal of Manufacturing Science and Engineering, 2017
In this paper, joining of Hastelloy has been successfully carried out by microwave hybrid heating... more In this paper, joining of Hastelloy has been successfully carried out by microwave hybrid heating process. The joints were developed by using a microwave oven at a frequency of 2.45 GHz and 900 W. A thin layer of slurry consisting of nickel-based powder and epoxy resin was introduced between the faying surfaces. The joints obtained by microwave hybrid heating were characterized by XRD, SEM–EDS, Vicker's microhardness, and tensile tests. Microstructure analysis revealed the formation of equiaxed grains, and results of XRD analysis revealed formation of some intermetallics and suppression of carbide formation. This can be attributed to the volumetric heating nature of microwaves. The microhardness study revealed 320 ± 25 HV hardness on grain surfaces and 680 ± 40 HV on grain boundaries. The tensile strength of the microwave processed joints was∼82% of base Hastelloy strength. The fractographic analysis of the fractured samples revealed a ductile fracture coupled with the shearing ...
Journal of Electrical Systems and Information Technology, 2015
In this proposed work a fuzzy logic based algorithm using discrete wavelet transform is developed... more In this proposed work a fuzzy logic based algorithm using discrete wavelet transform is developed for identifying the various faults in the electrical distribution system for an unbalanced distribution electrical power system. This technique is capable to identify the ten different types of faults with negligible effect of variation in fault inception angle, loading and other parameters of the power distribution system. The proposed method is tested on IEEE 13 bus electrical distribution system and on an Indian scenario of distribution system. The current of respective three phases is used as input signal for fault identification and the results obtained from the proposed method are more than satisfactory.
The ability of Pseudomonas stutzeri strain DCP-Ps1 to drive CaCO 3 biomineralization has been inv... more The ability of Pseudomonas stutzeri strain DCP-Ps1 to drive CaCO 3 biomineralization has been investigated in a microfluidic flowcell (i.e., micromodel) that simulates subsurface porous media. Results indicate that CaCO 3 precipitation occurs during NO 3 − reduction with a maximum saturation index (SI calcite) of ∼1.56, but not when NO 3 − was removed, inactive biomass remained, and pH and alkalinity were adjusted to SI calcite ∼ 1.56. CaCO 3 precipitation was promoted by metabolically active cultures of strain DCP-Ps1, which at similar values of SI calcite , have a more negative surface charge than inactive strain DCP-Ps1. A two-stage NO 3 − reduction (NO 3 − → NO 2 − → N 2) pore-scale reactive transport model was used to evaluate denitrification kinetics, which was observed in the micromodel as upper (NO 3 − reduction) and lower (NO 2 − reduction) horizontal zones of biomass growth with CaCO 3 precipitation exclusively in the lower zone. Model results are consistent with two biomass growth regions and indicate that precipitation occurred in the lower zone because the largest increase in pH and alkalinity is associated with NO 2 − reduction. CaCO 3 precipitates typically occupied the entire vertical depth of pores and impacted porosity, permeability, and flow. This study provides a framework for incorporating microbial activity in biogeochemistry models, which often base biomineralization only on SI (caused by biotic or abiotic reactions) and, thereby, underpredict the extent of this complex process. These results have wide-ranging implications for understanding reactive transport in relevance to groundwater remediation, CO 2 sequestration, and enhanced oil recovery.
Cardiovascular diseases (CVD) are important causes of global preventable morbidity and mortality ... more Cardiovascular diseases (CVD) are important causes of global preventable morbidity and mortality in which hypertension is an important public health concern worldwide being responsible for an annual death of 7.1 million.Researchers recognize that smoking is common among drinkers and that it is a strong risk factor for heart disease that could enhancethe true effect of alcohol consumption which itself can lead to the development of hypertension and other cardiovascular ailments. However, CVD presents differently in men and women and there is evidence that treatment efficacy is different between genders. Objective:The present study was undertaken to study the prevalence of hypertension and its associated factors viz. age, gender, smoking and alcohol among rural population of South India.Method:The current research was a questionnaire based study carried out in two phases with Blood Pressure measurement. Result:The study results showed that reasonable number of individuals were either ...
It is widely understood that selenite can be biologically reduced to elemental selenium. Limited ... more It is widely understood that selenite can be biologically reduced to elemental selenium. Limited studies have shown that selenite can also be immobilized through abiotic precipitation with sulfide, a product of biological sulfate reduction. We demonstrate that both pathways significantly contribute to selenite immobilization in a microfluidic flow cell having a transverse mixing zone between propionate and selenite that mimics the reaction zone along the margins of a selenite plume undergoing bioremediation in the presence of background sulfate. The experiment showed that red particles of amorphous elemental selenium precipitate on the selenite-rich side of the mixing zone, while long crystals of selenium sulfides precipitate on the propionate-rich side of the mixing zone. We developed a continuum-scale reactive transport model that includes both pathways. The simulated results are consistent with the experimental results, and indicate that spatial segregation of the two selenium precipitates is due to the segregation of the more thermodynamic favorable selenite reduction and the less thermodynamically favorable sulfate reduction. The improved understanding of selenite immobilization and the improved model can help to better design in situ bioremediation processes for groundwater contaminated by selenite or other contaminants (e.g., uranium(IV)) that can be immobilized via similar pathways.
2008 Joint International Conference on Power System Technology and IEEE Power India Conference, 2008
... VKChandna (M 08) graduated from Nagpur university in 1994 in Electronics & Power, complet... more ... VKChandna (M 08) graduated from Nagpur university in 1994 in Electronics & Power, completed his ME in Power Systems from ... Rajveer Singh graduated from Electrical Department Jamia Millia Islamia and post graduated from Netaji Subhash Institute of Technology, Delhi in ...
Page 1. Chapter 7 Application of Bacterial Swimming and Chemotaxis for Enhanced Bioremediation Ra... more Page 1. Chapter 7 Application of Bacterial Swimming and Chemotaxis for Enhanced Bioremediation Rajveer Singh and Mira S. Olson ... A comparative study of bacterial random motility and chemotaxis quantification assays is presented by Lewus and Ford [15]. ...
In this work the authors have grown good quality single crystals of zinc thiourea sulphate, bis t... more In this work the authors have grown good quality single crystals of zinc thiourea sulphate, bis thiourea cadmium acetate, bis zinc thiourea acetate and bis thiourea zinc chloride were grown from slow evaporation solution growth method at ambient temperature and studied their mechanical properties. The crystal system and lattice parameters were confirmed by powder X-ray diffraction analysis. Vickers microhardness of the grown crystals was investigated by using Leitz-Wetzlar (Miniload 2) hardness tester up to an applied load of 120 g. It was observed that, upto 40 g applied load the hardness of the grown crystals increases with increasing the load and thereafter it is practically independent of the indentation load. Meyer's law and Hays-Kendall's law fail to explain the observed load variations. But the variation could be satisfactorily explained by PSR model proposed by Li and Bradt. Classification of cracks and their transition from Palmqvist to median types is explained. The average value of fracture toughness, brittleness index, Young's modulus and yield strength were calculated using expressions for Palmqvist and median types of cracks. Anisotropic nature of the grown crystals was studied using Knoop indentation technique.
To advance the technology of polymer electrolyte membrane fuel cells, material development is at ... more To advance the technology of polymer electrolyte membrane fuel cells, material development is at the forefront of research. This is especially true for membrane electrode assembly, where the structuring of its various layers has proven to be directly linked to performance increase. In this study, we investigate the influence of the various ingredients in the cathode catalyst layer, such as ionomer content, catalyst loading and catalyst type, on the oxygen and ion transport using a full parametric analysis. Using two types of catalysts, 40 wt.% Pt/C and 60 wt.% Pt/C with high surface area carbon, the ionomer/carbon content was varied between 0.29–1.67, while varying the Pt loading in the range of 0.05–0.8 mg cm−2. The optimum ionomer content was found to be dependent on the operating point and condition, as well as catalyst loading and type. The data set provided in this work gives a starting point to further understanding of structured catalyst layers.
Broiler litter (BL) has the potential to be used as an alternative multi-nutrient source for soyb... more Broiler litter (BL) has the potential to be used as an alternative multi-nutrient source for soybean (Glycine max L.) production. While previous research on soybean yield response to BL has reported inconsistent results, the effects of BL application on soybean seed nutrient concentrations are largely unknown or less studied. The objective of this two-year field study was to investigate the effect of BL application on soybean yield and seed nutrient content in three different soil types and production environments. To pursue the objective, a field experiment was established in 2018 in a Compass loamy sand with four BL rates (0, 2.2, 5.6, and 11.2 Mg BL ha−1). In 2019, the study was expanded to include two additional soil types (Decatur silty clay loam and Dothan fine sandy loam) totaling four site years. The experimental design at each site was a randomized complete block with four replications. Application of BL had no impact on soybean yield in the first year, regardless of applic...
Journal of Biomolecular Structure and Dynamics, 2021
Glycogen synthase kinase-3 (GSK-3), a constitutively active serine/threonine kinase, primary regu... more Glycogen synthase kinase-3 (GSK-3), a constitutively active serine/threonine kinase, primary regulator of various cellular activities varying from glycogen metabolism to cell proliferation and regulation. GSK-3β is associated with the pathogenesis of numerous human diseases, including cancer, metabolic disorder, and Alzheimer's disease. In this study, Azadirachta indica compounds were selected and further screened on the BOILED-Egg model. The compounds showing good GIT absorption were docked with the crystal structure of GSK-3β. The compounds with high docking score were submitted for the molecular dynamic simulation (MDS) and Molecular Mechanics Poisson-Boltzmann Surface Area (MM-PBSA). Based upon the MDS and MM-PBSA study, gedunin showed the highest binding energy throughout the MDS process. Gedunin was isolated from the Azadirachta indica, and its efficacy on GSK-3β inhibition was studied in the human neuroblastoma (SH-SY5Y) cells. Gedunin induced apoptosis and anti-proliferative activity by arresting G2/M phase, as evident by cell-cycle analysis. From immunoblot study, gedunin significantly enhanced the expression of an inhibitory form of GSK-3β (p-GSK-3β Ser9) in concentration-dependent manner. Our findings demonstrate that gedunin may act as an effective GSK-3β inhibitor suggesting that this compound may be used for the management of neuroblastoma. Further preclinical and clinical investigation is desirable.Communicated by Ramaswamy H. Sarma.
ABSTRACT Extraction of electrical power from solar photovoltaic (PV) systems under nonuniform irr... more ABSTRACT Extraction of electrical power from solar photovoltaic (PV) systems under nonuniform irradiance such as partial shading (PSC) or fast transient conditions (FTC) is the most challenging task for the solar PV researchers. Inaccurate detection of PSC or FTC affects the efficiency of maximum power point tracking (MPPT) algorithms. As multiple peaks are found in the P–V curve, searching of the global peak among local peaks and stabilizing the output voltage is a typical task for an MPPT algorithm during PSC or FTC. Particularly for small isolated PV systems, the output system voltage stability is of more concern than power efficiency during PSC. Here, a Modified Perturb and Observation (P&O) (MP&O) MPPT algorithm is proposed for accurate detection of PSC, which stabilizes the system output voltage without compromising with power efficiency. For accurate detection of PSC, the MP&O MPPT algorithm uses irradiance (Ir(k)) and generated PV power (P(k)) as an input parameter and regulates the step size (dD) of the boost converter duty cycle (D). A PV system is simulated in MATLAB/Simulink and the performance of the proposed algorithm is also investigated using dSPACE controller, solar PV emulator and a SiC Mosfet switch under PSC. The accuracy to detect PSC or FTC of this algorithm is found satisfactory with fast tracking speed.
Journal of Evolution of Medical and Dental Sciences, 2017
BACKGROUND Gastroesophageal reflux disease, alkali or acid ingestion, achalasia due to unknown ae... more BACKGROUND Gastroesophageal reflux disease, alkali or acid ingestion, achalasia due to unknown aetiology are considered as main causative factors in the genesis of benign oesophageal strictures. The two types of treatment modalities are used including conservative dilatation and surgical approach according to aetiology and site of involvement. Our study attempts to understand the various aetiopathogenesis and epidemiological features of this problem and their clinical presentation; so that early detection maybe planned and various treatment modalities for achalasia cardia, peptic stricture, corrosive stricture and their results are evaluated. The aim of the study is to study various-1. Aetiological factors of stricture oesophagus (benign). 2. Features and clinical presentation of stricture oesophagus, so that early detection maybe planned. 3. Treatment methods of management of benign oesophageal strictures. MATERIALS AND METHODS This is a descriptive study of dysphagia due to benign oesophageal strictures. Cases presenting in the surgical outdoor with symptoms suggestive of oesophageal stricture and admitted in different surgical and gastroenterology units were included in the study. A detailed history and examination was done in these patients. Management was done by endoscopic or manual dilatation with bougies and/or surgical operation. Surgical management consisted of Heller's cardiomyotomy or oesophagoplasty. RESULTS Total number of 40 patients of dysphagia due to benign oesophageal strictures were studied out of which 16 (40%) patients were of corrosive strictures, 14 (35%) having achalasia cardia and 10 (25%) of peptic strictures. The male-to-female ratio was 1.35:1. The mean age was 42.62 years. Strictures due to corrosive were more common in younger age groups while 20170912mthe peptic stricture occurred later in life. The incidence of various symptoms were dysphagia 100%, regurgitation 45%, epigastric or substernal pain 35%, weight loss 25% and cough in 12% cases. Patients with GERD or achalasia cardia had more dysphagia to liquid/semi-solids, while patients with corrosive ingestion (alkali/acid) had more dysphagia to solids. The most common site affected was lower third of oesophagus in 55% of cases, followed by middle third (40%) and upper third (5%). In present study, out of 40 patients, 25 patients were treated conservatively in form of dilatation and operative intervention was done in 15 patients. All of the patients of stricture due to GERD were treated by conservative management. Most of the patients with corrosive ingestion/unknown aetiology were treated by conservative management. All of the patients with achalasia cardia were treated by operative management. One patient out of 25 managed with conservative treatment developed complication in the form of oesophageal perforation. Out of 15 patients that were managed by operative treatment, 5 developed pulmonary complications and 5 developed wound infections. Out of 4 patients who had undergone oesophagoplasty, 2 suffered with minor anastomotic leaks. In our study, after treatment (surgery/dilatation), 85% of patients were able to swallow most of solids and liquids, 10% of patients could swallow only solids and 5% of patients could swallow only liquids or semisolids. CONCLUSION It can be concluded that dysphagia due to benign oesophageal stricture maybe because of post-corrosive stricture, peptic stricture, achalasia cardia, etc. Conservative treatment in the form of dilatation gives excellent results in management of dysphagia. The surgery should be offered to the patients who are otherwise fit and dilatation cannot be done due to very narrow stricture. In operative patients, results of Heller's cardiomyotomy and esophagoplasties are excellent.
Lesions of the central nucleus of the third cranial nerve in midbrain leads to bilateral ptosis. ... more Lesions of the central nucleus of the third cranial nerve in midbrain leads to bilateral ptosis. We present a case of a 14 year old boy, who was found to have B/L non-correctable ptosis and medial rectus palsy. There was a ring enhancing lesion in the midbrain in contrast MRI which resolved with treatment. The case exemplifies that bilateral ptosis results from the central nucleus involvement of third nerve which has bilateral innervation.
International Journal of Renewable Energy Development, 2018
Small solar PV systems mostly residential PV systems are bounded to be low cost. So these systems... more Small solar PV systems mostly residential PV systems are bounded to be low cost. So these systems are required low-cost processors, and these low-cost processors can only process simple algorithm efficiently. The conventional P&O MPPT algorithm is widely employed algorithm to control solar PV systems because of its simplicity, low cost, and ease of implementation. During rapid radiation change condition (RRC) the output voltage of conventional P&O MPPT algorithm is found unstable and suffers oscillations around MPP at transient and steady state conditions. This paper proposes a simple MPPT algorithm for small or residential solar PV systems to eliminate such above said drawbacks. The proposed MPPT controls the step size (dD) of the boost converter duty cycle (D) according to the system input conditions and have the ability to compensate the transient as well as steady-state oscillations around MPP and stabilize the output voltage under RRC and variable load conditions. To validate t...
Microwave-assisted cyclocondensation of title compounds afforded unreported imidazo[1,2-a] quinox... more Microwave-assisted cyclocondensation of title compounds afforded unreported imidazo[1,2-a] quinoxaline and benzo[f]imidazo[1,5-a][1,3,5]triazepines in high yields.
Physical, chemical, and biological interactions between groundwater and sedimentary rock directly... more Physical, chemical, and biological interactions between groundwater and sedimentary rock directly control the fundamental subsurface properties such as porosity, permeability, and flow. This is true for a variety of subsurface scenarios, ranging from shallow groundwater aquifers to deeply buried hydrocarbon reservoirs. Microfluidic flow cells are now commonly being used to study these processes at the pore scale in simplified pore structures meant to mimic subsurface reservoirs. However, these micromodels are typically fabricated from glass, silicon, or polydimethylsiloxane (PDMS), and are therefore incapable of replicating the geochemical reactivity and complex three-dimensional pore networks present in subsurface lithologies. To address these limitations, we developed a new microfluidic experimental test bed, herein called the Real Rock-Microfluidic Flow Cell (RR-MFC). A porous 500μm-thick real rock sample of the Clair Group sandstone from a subsurface hydrocarbon reservoir of the...
Journal of Manufacturing Science and Engineering, 2017
In this paper, joining of Hastelloy has been successfully carried out by microwave hybrid heating... more In this paper, joining of Hastelloy has been successfully carried out by microwave hybrid heating process. The joints were developed by using a microwave oven at a frequency of 2.45 GHz and 900 W. A thin layer of slurry consisting of nickel-based powder and epoxy resin was introduced between the faying surfaces. The joints obtained by microwave hybrid heating were characterized by XRD, SEM–EDS, Vicker's microhardness, and tensile tests. Microstructure analysis revealed the formation of equiaxed grains, and results of XRD analysis revealed formation of some intermetallics and suppression of carbide formation. This can be attributed to the volumetric heating nature of microwaves. The microhardness study revealed 320 ± 25 HV hardness on grain surfaces and 680 ± 40 HV on grain boundaries. The tensile strength of the microwave processed joints was∼82% of base Hastelloy strength. The fractographic analysis of the fractured samples revealed a ductile fracture coupled with the shearing ...
Journal of Electrical Systems and Information Technology, 2015
In this proposed work a fuzzy logic based algorithm using discrete wavelet transform is developed... more In this proposed work a fuzzy logic based algorithm using discrete wavelet transform is developed for identifying the various faults in the electrical distribution system for an unbalanced distribution electrical power system. This technique is capable to identify the ten different types of faults with negligible effect of variation in fault inception angle, loading and other parameters of the power distribution system. The proposed method is tested on IEEE 13 bus electrical distribution system and on an Indian scenario of distribution system. The current of respective three phases is used as input signal for fault identification and the results obtained from the proposed method are more than satisfactory.
The ability of Pseudomonas stutzeri strain DCP-Ps1 to drive CaCO 3 biomineralization has been inv... more The ability of Pseudomonas stutzeri strain DCP-Ps1 to drive CaCO 3 biomineralization has been investigated in a microfluidic flowcell (i.e., micromodel) that simulates subsurface porous media. Results indicate that CaCO 3 precipitation occurs during NO 3 − reduction with a maximum saturation index (SI calcite) of ∼1.56, but not when NO 3 − was removed, inactive biomass remained, and pH and alkalinity were adjusted to SI calcite ∼ 1.56. CaCO 3 precipitation was promoted by metabolically active cultures of strain DCP-Ps1, which at similar values of SI calcite , have a more negative surface charge than inactive strain DCP-Ps1. A two-stage NO 3 − reduction (NO 3 − → NO 2 − → N 2) pore-scale reactive transport model was used to evaluate denitrification kinetics, which was observed in the micromodel as upper (NO 3 − reduction) and lower (NO 2 − reduction) horizontal zones of biomass growth with CaCO 3 precipitation exclusively in the lower zone. Model results are consistent with two biomass growth regions and indicate that precipitation occurred in the lower zone because the largest increase in pH and alkalinity is associated with NO 2 − reduction. CaCO 3 precipitates typically occupied the entire vertical depth of pores and impacted porosity, permeability, and flow. This study provides a framework for incorporating microbial activity in biogeochemistry models, which often base biomineralization only on SI (caused by biotic or abiotic reactions) and, thereby, underpredict the extent of this complex process. These results have wide-ranging implications for understanding reactive transport in relevance to groundwater remediation, CO 2 sequestration, and enhanced oil recovery.
Cardiovascular diseases (CVD) are important causes of global preventable morbidity and mortality ... more Cardiovascular diseases (CVD) are important causes of global preventable morbidity and mortality in which hypertension is an important public health concern worldwide being responsible for an annual death of 7.1 million.Researchers recognize that smoking is common among drinkers and that it is a strong risk factor for heart disease that could enhancethe true effect of alcohol consumption which itself can lead to the development of hypertension and other cardiovascular ailments. However, CVD presents differently in men and women and there is evidence that treatment efficacy is different between genders. Objective:The present study was undertaken to study the prevalence of hypertension and its associated factors viz. age, gender, smoking and alcohol among rural population of South India.Method:The current research was a questionnaire based study carried out in two phases with Blood Pressure measurement. Result:The study results showed that reasonable number of individuals were either ...
It is widely understood that selenite can be biologically reduced to elemental selenium. Limited ... more It is widely understood that selenite can be biologically reduced to elemental selenium. Limited studies have shown that selenite can also be immobilized through abiotic precipitation with sulfide, a product of biological sulfate reduction. We demonstrate that both pathways significantly contribute to selenite immobilization in a microfluidic flow cell having a transverse mixing zone between propionate and selenite that mimics the reaction zone along the margins of a selenite plume undergoing bioremediation in the presence of background sulfate. The experiment showed that red particles of amorphous elemental selenium precipitate on the selenite-rich side of the mixing zone, while long crystals of selenium sulfides precipitate on the propionate-rich side of the mixing zone. We developed a continuum-scale reactive transport model that includes both pathways. The simulated results are consistent with the experimental results, and indicate that spatial segregation of the two selenium precipitates is due to the segregation of the more thermodynamic favorable selenite reduction and the less thermodynamically favorable sulfate reduction. The improved understanding of selenite immobilization and the improved model can help to better design in situ bioremediation processes for groundwater contaminated by selenite or other contaminants (e.g., uranium(IV)) that can be immobilized via similar pathways.
2008 Joint International Conference on Power System Technology and IEEE Power India Conference, 2008
... VKChandna (M 08) graduated from Nagpur university in 1994 in Electronics & Power, complet... more ... VKChandna (M 08) graduated from Nagpur university in 1994 in Electronics & Power, completed his ME in Power Systems from ... Rajveer Singh graduated from Electrical Department Jamia Millia Islamia and post graduated from Netaji Subhash Institute of Technology, Delhi in ...
Page 1. Chapter 7 Application of Bacterial Swimming and Chemotaxis for Enhanced Bioremediation Ra... more Page 1. Chapter 7 Application of Bacterial Swimming and Chemotaxis for Enhanced Bioremediation Rajveer Singh and Mira S. Olson ... A comparative study of bacterial random motility and chemotaxis quantification assays is presented by Lewus and Ford [15]. ...
In this work the authors have grown good quality single crystals of zinc thiourea sulphate, bis t... more In this work the authors have grown good quality single crystals of zinc thiourea sulphate, bis thiourea cadmium acetate, bis zinc thiourea acetate and bis thiourea zinc chloride were grown from slow evaporation solution growth method at ambient temperature and studied their mechanical properties. The crystal system and lattice parameters were confirmed by powder X-ray diffraction analysis. Vickers microhardness of the grown crystals was investigated by using Leitz-Wetzlar (Miniload 2) hardness tester up to an applied load of 120 g. It was observed that, upto 40 g applied load the hardness of the grown crystals increases with increasing the load and thereafter it is practically independent of the indentation load. Meyer's law and Hays-Kendall's law fail to explain the observed load variations. But the variation could be satisfactorily explained by PSR model proposed by Li and Bradt. Classification of cracks and their transition from Palmqvist to median types is explained. The average value of fracture toughness, brittleness index, Young's modulus and yield strength were calculated using expressions for Palmqvist and median types of cracks. Anisotropic nature of the grown crystals was studied using Knoop indentation technique.
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